INFRA AQUA DESIGN. Hot water radiant panels EN CLIMATE TECHNOLOGY FEELS BETTER, WORKS BETTER.

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1 INFRA AQUA DESIGN Hot water radiant panels EN CLIMATE TECHNOLOGY FEELS BETTER, WORKS BETTER.

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Advantages of the Mark radiant panel Application areas 9 10 10 OPTIONAL: ACOUSTIC PANELS INTEGRATION IN CEILING

3 CONTENT WHAT IS RADIANT HEATING? Comfort level Why radiant heating? Zone or localised heating System benefits Graph (Temperature gradient) MARK RADIANT PANEL Advantages of the Mark radiant panel Application areas OPTIONAL: ACOUSTIC PANELS INTEGRATION IN CEILING GRID APPLICATION IN SPORTS HALLS Ball removal plates TECHNICAL SPECIFICATIONS Dimensions Detailed view / weight The PUR-foam insulated panel

Full contact surface Different expansion coefficients Expansion noises Heat output Minimum mounting height with long residence times and a low activity level Radiant panels mounted under a pitched

and connection Graph: pressure loss in the pipe Graph: pressure loss in collector and connection Possible connections 18 19 19 20 21 22 ASSEMBLY Assembly tightly/directly against the ceiling Press

4 Full contact surface Different expansion coefficients Expansion noises Heat output Minimum mounting height with long residence times and a low activity level Radiant panels mounted under a pitched roof Relationship between minimum mass flow and return temperature Calculating the pressure loss of the Mark radiant panel Calculating the pressure loss of the register, collector and connection Graph: pressure loss in the pipe Graph: pressure loss in collector and connection Possible connections ASSEMBLY Assembly tightly/directly against the ceiling Press fittings Hanging methods Hanging distance CONTROL Water-based Room temperature Weather-dependent inlet temperature control Zone control Zone inside temperature control Weather-dependent inlet temperature control

5 CONTENT LOGISTICS Packing Delivery and unloading Finishing ACCESSORIES 26 SPECIFICATIONS Insulated with PUR hard foam Alternative: insulated with mineral wool insulation

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What is radiant heating? Radiant heating is based on the principle of the heat transfer of a warm body to a body with a lower temperature by means of electromagnetic wave energy.

This produces a convective flow of slowly rising warm air and colder air falling again that blend (induction).

7 What is radiant heating? Radiant heating is based on the principle of the heat transfer of a warm body to a body with a lower temperature by means of electromagnetic wave energy. This electromagnetic wave is not hindered by air, radiates walls, floor and other bodies in the specific room. These items absorb the radiation energy and then pass the heat on to the heat air stream. This produces a convective flow of slowly rising warm air and colder air falling again that blend (induction). The heating of the air in the space takes place substantially by this convective air flow from the heated floor and walls. Heating a room by means of radiant panels always causes the floor temperature to be a few degrees higher than the room air temperature which in turn is experienced as very comfortable. Even directly under the radiation panel, the vertical temperature gradient is very low. As the roof is often the largest surface that is directly in contact with the outside air, with air heating more energy will be lost by heating this cold surface (see graph Temperature per meter height on page 8). Although this can be overcome by a high circulation times in space which, however, requires extra energy, during which a high air displacement occurs. Consequence: drafts and dust displacement. Floor and walls remain cold! COMFORT When our body gives more heat to its environment than it produces, we experience this as uncomfortable. The ideal method to heat cold surfaces is by means of radiant panels mounted on the ceiling which transfer their heat mainly through radiation. Persons who are radiated in a room experience less heat loss and therefore greater comfort. As a result, the room air temperature may be set a few degrees lower. This way, in addition to more comfort energy saving can be realized. 7

8 Radiant heating WHY RADIANT HEATING? Radiant heating has been used for decades in areas ranging from 2.5 to 25 meters suspension height. Radiant heating is installed at places where it costs nothing, namely on the ceiling. Radiant heating is relatively quickly assembled, has no maintenance, produces no noise and has a very long life. ZONE OR LOCALISED HEATING Radiant heating is also ideal for zone or local heating. Only the area to be heated is radiated. As a result, the energy costs are limited to a minimum. SYSTEM BENEFITS Fast controllability by a low water content. Uniform temperature distribution all over the horizontal area. Very low vertical temperature gradient. Zone or local heating is possible. Still air layer, no dust or drafts. Room temperature is 3 C lower than heating by radiators or air heating % energy savings compared to conventional air heating. 15% less full load hours. Very long life. Completely maintenance free. Great comfort by direct radiation. Heated floor. Space saving. Silent. Can be applied everywhere due to unobtrusive design. GRAPH (the difference in the vertical temperature gradient for radiant heating and air heating) HEIGHT IN METERS radiant panels 3 air heating with fans air heating TEMPERATURE IN DEGREES CELSIUS 8

The hot water tube bundle, composed of tubes with a diameter of 28 mm (untreated or galvanized) is surrounded by profiled aluminium plates for more than 80% and reinforced by spring clips.

9 Mark radiant panel Mark radiant panel consists of a number of hot water tubes. When the water reaches the appropriate flow, turbulence is created which in turn provides an optimum heat transfer from water to metal. The hot water tube bundle, composed of tubes with a diameter of 28 mm (untreated or galvanized) is surrounded by profiled aluminium plates for more than 80% and reinforced by spring clips. A multi-angle conversion gives a very large stiffness to the angle profiles of the panel. A U profile welded to the register enables a stable suspension. To achieve this, there are M8 blind rivet nuts applied in the U profile. To prevent heat loss to the upper side, the panels are equipped with a 40 mm mineral wool with double reinforced aluminium foil insulation. (Fire Class A1/A2). Another option is a 50 mm rigid PUR foam layer. The cover plates and end caps ensure a neat finish. 9

THE ADVANTAGES OF THE MARK RADIANT PANEL High output of the panel, obtained by 80% metal contact of tube/aluminium fin. The use of aluminium, a very good thermal conductivity.

Very tight and therefore perfectly integrated into a (suspended) ceiling grid, e.g. width 590 mm. Standard colour RAL 9010 with scratchproof paint, optionally available in any RAL colour.

Zinc plating of the registers when used in damp spaces. (optional) Mark provides complete engineering.

10 THE ADVANTAGES OF THE MARK RADIANT PANEL High output of the panel, obtained by 80% metal contact of tube/aluminium fin. The use of aluminium, a very good thermal conductivity. High insulation value by applying 40 mm mineral wool or 50 mm rigid PUR foam. Pre-assembled insulation. Aesthetically beautiful and entirely flat panel. Very tight and therefore perfectly integrated into a (suspended) ceiling grid, e.g. width 590 mm. Standard colour RAL 9010 with scratchproof paint, optionally available in any RAL colour. Low weight Wide standard range of 6 types, lengths depending on project. Panels are supplied complete with an assembled insulation and welded collectors. Collectors are standardly primed. Zinc plating of the registers when used in damp spaces. (optional) Mark provides complete engineering. APPLICATION AREAS Auto showrooms Furniture showrooms DIY-buildings Schools Sports-/Tennis halls Social (sheltered) workshops Bakeries Printing / Press rooms Paints factories Machine factories Fire stations Police stations Production halls Hospitals and nursing homes Logistic halls Areas with a danger of gas and/or explosion. Directive 94/9/EC (Atex 95). Optional: acoustic panels 1,4 The Mark Infra Aqua Design radiant panels can optionally be supplied in a perforated version for optimum room damping. ABSORPTION COEFFICIENT (α) 1,2 1 0,8 0,6 0,4 0, FREQUENCY (Hz) Mark Infra Aqua Design radiant panel Mark Infra Aqua Design radiant panel with perforation 10

Application in a (suspended) ceiling grid The radiant panel is perfectly integrated into a (suspended) ceiling grid.

In terms of sizing the panel type 600-4 with a width of 590 mm is an obvious choice.

In addition to the standard ceiling sizes (590, 1190. 1790, 2390 mm etc.

11 Application in a (suspended) ceiling grid The radiant panel is perfectly integrated into a (suspended) ceiling grid. The flat aluminium surface with a fine line pattern gives an aesthetic effect that fits into any ceiling. In terms of sizing the panel type with a width of 590 mm is an obvious choice. For higher output, also the type (1190 mm wide) can be applied. In addition to the standard ceiling sizes (590, , 2390 mm etc.) the panels are also available in intermediate sizes for customization. FEATURES Any length size is possible Top connection Aluminium panel with low weight High heat output Polyurethane (PUR)and mineral wool (GLW) insulation * * Image is shown without cover. 11

Application in a sports hall The most optimal way of

displacement of air and the associated noise.

form a danger to the users of the space.

In particular, the ball resistance is of importance for

12 Application in a sports hall The most optimal way of heating a sports hall or gymnasium is by means of water based radiant panels. Spaces can be heated quickly and separately without the displacement of air and the associated noise. In addition to this, the panels on the ceiling do not form a danger to the users of the space. All objects in a sports hall are exposed to heavy duty. In particular, the ball resistance is of importance for the safety. That is why all panels are approved by the ISP for the ball resistance. Ball removal plates (optional) 12

13 Technical specifications DIMENSIONS Top view C C / x 1,5 mm Front view Type Width = A B/C in mm Mounting points (6m) 3x2 3x2 3x2 3x2 3x2 3x2 3x3 3x3 D (number of tubes) L total TYPE B L= 6000 TYPE A L = 6000 TYPE B L = Standard L = 3000, 4000, 5000 en 6000 mm. Size in between = price of next higher standard size. Suspension dimensions are variable, maximum 3 per 6 meter panel. There is a surcharge for multiple mounting profiles. The maximum spacing of supporting profiles is 2500 mm. End cap Radiant panel Cover plate PUR-foam fill-up piece Radiant panel End cap Head board End cap Radiant panel Head board PUR-foam fill-up piece End cap

* (optional) 11 = Slit hole for tapping screws * Type 450-3 600-4 750-5 900-6 1050-7 1200-8 1350-9 1500-10 Heat output 15ºC (90/70 C) room

weight PUR (filled) Weight collector GLW / PUR (filled) * The air point is to be placed at the highest point of the installation.

14 DETAILED VIEW / WEIGHT 1 = Aluminium radiation reflector 2 = Water based tube 3 = Collector 4 = Water sided connection 5 = Mounting profile with M8 blind rivet nuts 6 = Insulation 7 = Cover plate between two panels 8 = Cover plate collector 9 = Drain point (optional) 10 = Air point * (optional) 11 = Slit hole for tapping screws * Type Heat output 15ºC (90/70 C) room temperature W/m Water content kg/m 1,47 1,96 2,45 2,94 3,43 3,92 4,41 4,90 Panel weight GLW (filled) Panel weight PUR (filled) Weight collector GLW / PUR (filled) * The air point is to be placed at the highest point of the installation. ** Not available with PUR. kg/m 6,24 8,49 10,55 12,82 14,67 16,73 18,79 20,85 kg/m 6,87 9,44 11,74 15,42 16,35 18,66 ** ** kg/m 1,55 2,13 2,70 3,28 3,86 4,44 5,01 5,58 14

DIFFERENT EXPANSION COEFFICIENTS The Mark Infra Aqua Design panels are composed of steel registers and aluminium sidings.

15 THE PUR HARD FOAM PANEL CASTING MOULD WITH RADIANT PANEL FULL CONTACT SURFACE The casting mould in which the register and the aluminium profile plate are placed is injected with PUR foam and simultaneously provided with an aluminium kraft foil and after which all items are being transported in a press. The polyurethane foam expands and exerts a high pressure on all sides (see drawing). The drawing clearly shows the forces that occur in the mould during which the aluminium is pressed onto the profile with great force. the water-pipe is pressed. Large contact surface pipe/plate. Aluminium is a very good heat conductor. High insulation value of polyurethane foam. DIFFERENT EXPANSION COEFFICIENTS The Mark Infra Aqua Design panels are composed of steel registers and aluminium sidings. Aluminium has a greater expansion coefficient than steel, but can expand freely because the aluminium profile is 100 mm shorter than the registry. Cover plates are mounted at the area of the connections between panels. EXPANSION SOUNDS PUR rigid foam adheres with great resistance on the aluminium profile. The resilience which the PUR foam retains, captures the linear expansion of the aluminium. Because of this, expansion sounds do not occur. 15

16 HEAT OUTPUT RADIANT PANEL, TYPE to Heat output table in W/m1, in accordance with EN COLLECTOR TYPE to Heat output table in W/m1, in according EN per 2 collectors K K K = Average water temperature - room temperature. Values at a mass flow of 0.04 litres per second / pipe. * Values apply to both PUR foam and mineral wool insulation. 16

17 MINIMUM MOUNTING HEIGHT WITH A LONG RESIDING TIME AND A LOW ACTIVITY LEVEL The prevention of a too high radiation temperature in low areas: By reducing medium temperature. By applying narrow panel lengths * (Ta+Tr) 2 Ta = Water temperature supply Tr = Water temperature return AVERAGE MEDIUM TEMPERATURE* ,5 4 4,5 5 5,5 6 6,5 7 MINIMUM MOUNTING HEIGHT IN METRES When mounting in suspended (lowered) ceiling, the output is reduced by 8%. RADIANT PANELS MOUNTED IN AN INCLINED ROOF The total output when mounted under an inclined roof is increased bye the increasing convection. The correction factor can be determined with the graph on the right. Total output = output per linear metres x correction factor CORRECTION FACTOR INCLINE ANGLE OF INCLINED MOUNTED PANELS 17

RELATIONSHIP BETWEEN THE MINIMUM MASS FLOW AND RETURN TEMPERATURE The graph below shows the relationship between the minimum mass flow and the return temperature.

In case this mass flow rate is too low (often caused by short panel lengths), a laminar flow is created which in turn results in a strong decline of the heat output.

18 RELATIONSHIP BETWEEN THE MINIMUM MASS FLOW AND RETURN TEMPERATURE The graph below shows the relationship between the minimum mass flow and the return temperature. The minimum mass flow is required to obtain a turbulent flow in the pipes. Only then the heat output can be realized. In case this mass flow rate is too low (often caused by short panel lengths), a laminar flow is created which in turn results in a strong decline of the heat output. A too low mass flow in the tubes can be prevented by: Decreasing the difference between the flow and return temperature. Applying separation plates in the collector. Connecting multiple panel lengths in series. MINIMUM MASS FLOW IN KG/H BY PIPE * RETURN TEMPERATURE IN DEGREES CELSIUS * Example calculation on page 19 18

19 THE CALCULATION OF PRESSURE LOSSES OF THE MARK RADIATION PANELS The resistance of the most optimally selected panel is as low as possible and yet mass flow rate is sufficient. Depending on the type of panel, this is determined by: the mass flow of the medium per panel the method of connection of the hydraulic system The mass flow per panel is calculated using the output and the difference between the flow and return temperature: M = P kg/s Cp x t P = total output of the panel in W. t = total output of the panel in Cp = specific heat of water ± 4200 J/(kg.K) The thermal output of the panel can be calculated using the table on page 16. The factor K is defined by: K = Ta+Tr -Tu 2 Ta = flow temperature of the water Tr = return temperature of the water Tu = room temperature CALCULATING PRESSURE LOSSES IN REGISTERS, COLLECTORS AND CONNECTIONS Example 1 Example 2 Panel type MARK 900-6, L = 30 m Connection two-sided (mass flow over 6 pipes). Medium temperature 90/70ºC, Room temperature 15ºC Heat output page 16, K = (90+70)/2-15 = 65 Using K = 65: heat output panel = 30 x 523 = W, heat output 2 collectors 246 W Mass flow per panel ( )/(4200x20) = 0,190 kg/s = 683 kg/h. Mass flow per pipe = 683 / 6 = 114 kg/h. Minimum mass flow page 18: 80 kg/h at a return temperature of 70ºC. Conclusion: sufficient. Pressure loss in the pipes at 114 kg/h, page 20: p at 30 meter = 150 Pa Pressure loss in both collectors at 683 kg/h, page 21: p = 2 x 120 Pa = 240 Pa Total: = 390 Pa Panel type MARK 900-6, L = 30 m Connection two-sided (mass flow over 3 pipes). Medium temperature 90/70ºC, Room temperature 15ºC Heat output page 16, K = (90+70)/2-15 = 65 Using K = 65: heat output panel = 30 x 523 = W, heat output 2 collectors 246 W Mass flow per panel ( )/(4200x20) = 0,190 kg/s = 683 kg/h. Mass flow per pipe = 683/3 = 228 kg/h. Minimum mass flow page 18: 80 kg/h at a return temperature of 70ºC. Conclusion: sufficient. Pressure loss in the pipes at 228 kg/h, page 20: p at 30 meter = 400 Pa, p at 60 Meter = 2 x 400 = 800 Pa Pressure loss in the 3 (!) collectors at 683 kg/h, page 21: p = 3 x 120 = 360 Pa Total: = 1160 Pa 19

20 PRESSURE LOSS IN PIPE 4 l/h PRESSURE LOSS (KPa) LENGTH PANEL (m) 20

21 PRESSURE LOSS IN COLLECTORS AND CONNECTIONS 3 PRESSURE LOSS (KPa) MASS FLOW in kg/h 21

22 CONNECTION POSSIBILITIES (and flow direction of the fluid) * The drawings above are provided with front connections. Top connections are also possible. 22

Project planning, assembly and suspension B 1/3 H 1 x H 1/3 H H ASSEMBLY TIGHTLY AGAINST THE CEILING When the panel is mounted tightly against the ceiling, this gives an attractive effect and when

23 Project planning, assembly and suspension B 1/3 H 1 x H 1/3 H H ASSEMBLY TIGHTLY AGAINST THE CEILING When the panel is mounted tightly against the ceiling, this gives an attractive effect and when used in a sports hall no ball removal plates will be needed. h = height, b = width Mark B.V. can deliver panels with 18 mm holes in the aluminium profile of the panel at the location of the points of suspension which enables the mounting of the panel directly against the ceiling. The holes can be covered after installation with covering caps in the colours black or white. Because of the linear expansion of the panel is the maximum length with this suspension method is 24 m. Ceiling Spacer Threaded bolt Covering cap PRESS FITTINGS Mark B.V. delivers approved press fittings as an option. Applying other fittings can lead to leaks for which Mark B.V. Mark cannot be held liable. D L Z E A B A B 23

24 MOUNTING METHODS Method A: by using threaded rods. Method B suspension by using steel wire Perforated diagonal Threaded rod M6 ball joint M8/M6 Steel wire Eye-bolt M8 TYPE TYPE Method C: by using hangers. Method D: suspension by using hangers Perforated diagonal Hanger Eye-bolt M8 Hanger Eye-bolt M8 TYPE TYPE Method E: by using chains. Method F: suspension by using chains an chain tensioners Perforated diagonal S-hook chain chain carbine hook carbine hook TYPE chain tensioner TYPE

25 Control WATER-SIDED A low water content of the system and a relatively high flow rate of the heating medium results in a very good controllability of the installation. To maintain a constant design temperature to maintain, the control should be through the flow temperature of the heating medium based on a mixing arrangement so that a turbulent flow in the tubes is maintained. ROOM TEMPERATURE The room temperature is preferably controlled by means of a black bulb sensor. (see accessories). WEATHER DEPENDENT FLOW TEMPERATURE CONTROL With room temperature compensation The set value Xs of the outdoor controller is shifted until the desired temperature ti is reached. ZONE CONTROL In order to obtain different indoor temperatures ti For example, a production area of 18 C and a warehouse of 16 C. The outdoor temperature control as pre-control enables to work with a higher supply temperature than is strictly necessary for the individual zones. ti ti ti Pi Pi M M R tv ta tv Pi M V ta Pi ** M * R V ZONE INDOOR TEMPERATURE CONTROL By switching off and the switching on/off of the radiant panels. Weather-dependant supply temperature control with PI controller, supplemented with a room thermostat controlled solenoid valve, which switches a portion of the water sided heated surface in case the set value Xs of the room thermostat is exceeded. With a pump, several areas can be fed water-sided. Each zone is divided in at least 2 groups water-sided. Very favourable control system for installations with extreme heat load and for time-controlled temperature reductions (e.g.: night and weekend reductions). WEATHER DEPENDENT SUPPLY TEMPERATURE 2 Handling (no control) of the inside temperature Ti by the supply temperature tv. Simplest solution, without feedback from the indoor temperature ti. Zone 1 Zone 2 ~ ~ ta ta tv ti Pi tv Pi V R M M * * R V * Piping network according Tichelman. ** Piping network connected in series to provide the outer panels with a higher heat output. ta = outside temperature ti = inside temperature tv = supply temperature Pi = regulator R = return line V = supply line M = motor-operated valve = cartridge 25

Logistics PUR-version Glass wool-version Transport unit (Maximum stack of 20

PACKAGING Each Mark radiant panel is wrapped in protective foil and stacked

Panels with mineral wool are stacked alternately and at the part of the

Pipe ends and collectors are provided with cable ties.

FINISHING Mark delivers the panels in the colour RAL 9010 as standard.

DELIVERY AND UNLOADING The manufacturing of the Mark radiant panels is

The pressure during the testing of the panels is 16 bar and after the final

26 Logistics PUR-version Glass wool-version Transport unit (Maximum stack of 20 panels per pallet) Transport unit (Maximum stack of 20 panels per pallet) PACKAGING Each Mark radiant panel is wrapped in protective foil and stacked up to a maximum of 20 panels. Panels with mineral wool are stacked alternately and at the part of the tubes, the panels are provided with filling timber. Pipe ends and collectors are provided with cable ties. The panels are transported on a pallet. FINISHING Mark delivers the panels in the colour RAL 9010 as standard. As an option, any RAL colour is available with an extra over price. DELIVERY AND UNLOADING The manufacturing of the Mark radiant panels is project-based. The pressure during the testing of the panels is 16 bar and after the final inspection (each panel is manually cleaned and checked), much attention is being paid to the packaging and transport. Accessories & parts Possible accessories to be supplied are: Flow controllers High pressure cartridges Press fittings Corner panels Ball removal plates Plate covers Black bulb sensors 26

Specification INSULATED WITH PUR HARD FOAM Mark radiant panels, consisting of a water-fedregister, composed of from a 28 mm steel pipe. The standard pipe distance is150 mm. Standard black pipe.

27 Specification INSULATED WITH PUR HARD FOAM Mark radiant panels, consisting of a water-fedregister, composed of from a 28 mm steel pipe. The standard pipe distance is150 mm. Standard black pipe. Galvanized pipe on request. Hanging tubular profile 15 x 15 x 1.5 mm. Provided with 2 pieces of M8 blind rivet nuts with the exception of type where 3 pieces M8 blind rivet nuts are used. ALTERNATIVE: INSULATED WITH MINERAL WOOL Mineral wool insulation thickness 40 mm. Thermal conductivity group 040. Provided with insulate holders. Fire Class A1/A2 Covered with reinforced double layer aluminium Welded collectors, consisting of tubular profile 40 x 40 x 2.5 mm at the ends provided with welded end plates. Collectors are equipped with anti-rust paint in the colour grey. Collectors are provided with the necessary connector fittings: ½, ¾ or 1. Aluminium profiled panels, viewed side foreseen with a polyester coating, RAL 9010 matt. Temperature up to 120ºC. Aluminium plate thickness is 0.75 mm. Connecting pipe/ plate by means of clamping springs. At the top the panels are provided with PUR hard foam, fire class B2 according to DIN 4102, CFC-free, finished with a fiberglass reinforced ALU-foil. PUR hard foam filling pad, width 100 mm, at the place of the covers. Aluminium cover plates, width 150 mm, RAL 9010, with slots 3 x 9 mm for fixation. Self-drilling, galvanized tapping screws, 2.9 x 9.5 mm. Aluminium end cap, width 100 mm, colour RAL Mounting profile with mounting strip. Slots 3 x 9 mm for fixation. Self-drilling galvanized tapping screws, 2.9 x 9.5 mm. To be mounted after the installation of the panel for the finishing of the collector. Standard panel lengths of 3, 4, 5 and 6 meters. Any length up to 6 meter can be delivered. Packaging: panels are packed in foil. Because of the transportability the panels are packed with lengths of maximum 6 meters and assembled by the installer on site to obtain the desired length. Mounting brackets are supplied on request. Working pressure up to 16 Bar. Not available for type

28 CERTIFICATION N : AIRSTREAM CLIMATE TECHNOLOGY FEELS BETTER, WORKS BETTER. MARK Climate Technology Beneden Verlaat BM Veendam The Netherlands T: +31(0) E: info@markclimate.com I: MARK EIRE BV Coolea, Macroom Co. Cork P12 W660 (Ireland) T: E: I: +353 (0) sales@markeire.com _R10

INFRA RADIATION EFFICIENCY UP TO 75%

REN E D WE INFRA RADIATION EFFICIENCY UP TO 20 13 75% C L I M AT E T E C H N O L O G Y FEELS BETTER, WORKS BETTER. W W W. M A R KC L I M AT E.C O M INFRA The radiant tube that fires up! MARK INFRA black